diff --git a/t/deps/basic/.gitignore b/t/deps/basic/.gitignore
new file mode 100644
index 0000000..073f461
--- /dev/null
+++ b/t/deps/basic/.gitignore
@@ -0,0 +1,2 @@
+*.log
+*.out
diff --git a/t/deps/basic/1.in b/t/deps/basic/1.in
new file mode 100644
index 0000000..ab25f6b
--- /dev/null
+++ b/t/deps/basic/1.in
@@ -0,0 +1 @@
+this is 1
\ No newline at end of file
diff --git a/t/deps/basic/2.in b/t/deps/basic/2.in
new file mode 100644
index 0000000..c825d65
--- /dev/null
+++ b/t/deps/basic/2.in
@@ -0,0 +1 @@
+this is 2
diff --git a/t/deps/basic/default.out.do b/t/deps/basic/default.out.do
new file mode 100644
index 0000000..cd73106
--- /dev/null
+++ b/t/deps/basic/default.out.do
@@ -0,0 +1,3 @@
+redo-ifchange $1.in
+echo $$
+echo $$ >>$1.log
diff --git a/t/deps/basic/test.do b/t/deps/basic/test.do
new file mode 100644
index 0000000..90b9126
--- /dev/null
+++ b/t/deps/basic/test.do
@@ -0,0 +1,12 @@
+rm -f *.out *.log
+
+. ../../flush-cache.sh
+redo-ifchange 1.out 2.out
+[ "$(cat 1.log | wc -l)" = 1 ] || exit 55
+[ "$(cat 2.log | wc -l)" = 1 ] || exit 56
+. ../../flush-cache.sh
+touch 1.in
+redo-ifchange 1.out 2.out
+[ "$(cat 1.log | wc -l)" = 2 ] || exit 57
+[ "$(cat 2.log | wc -l)" = 1 ] || exit 58
+
diff --git a/t/deps/test.do b/t/deps/test.do
index 6a30599..dc03f0c 100644
--- a/t/deps/test.do
+++ b/t/deps/test.do
@@ -1,3 +1 @@
-redo test1 test2 ifchange-fail overwrite
-
-
+redo test1 test2 ifchange-fail overwrite basic/test
diff --git a/t/flush-cache.sh b/t/flush-cache.sh
new file mode 100644
index 0000000..83e87ba
--- /dev/null
+++ b/t/flush-cache.sh
@@ -0,0 +1,3 @@
+echo "Flushing redo cache..." >&2
+find "$REDO_BASE/.redo" -name 'built^*' -o -name 'mark^*' |
+	xargs rm -f >&2